the copyright and authority for the interpretation of the products are reserved by mornsun specifications subject to change without notice. vra_ld-20w 2013.06.13-a/3 page 1 of 4 vra_ld-20w series 20w, 2:1 wide input isolated & regulated dual output dc-dc converter patent protection rohs features product program input output voltage (vdc) model nominal range max (1) voltage (vdc) rated current (2) (ma) capacitor load max (3) ( f) efficiency (%, typ) vra1205ld-20w 5 2000 4800 84 vra1212ld-20w 12 833 800 88 vra1215ld-20w 15 667 500 88 vra1224ld-20w 12 9~18 20 24 416 300 87 vra2405ld-20w 5 2000 4800 84 vra2412ld-20w 12 833 800 89 vra2415ld-20w 15 667 500 88 vra2424ld-20w 24 18~36 40 24 416 300 87 vra4805ld-20w 5 2000 4800 85 vra4812ld-20w 12 833 800 87 vra4815ld-20w 15 667 500 88 VRA4824LD-20W 48 36~75 80 24 416 300 87 note: add suffix h for heat sink mounted, for example vra2405ld-20wh. common specifications item test conditions min. typ. max. units storage humidity 5 -- 95 % operating temperature -40 -- 85 storage temperature -55 -- 125 maximum case temp. on working temperature -- -- 105 lead temperature 1.5mm from case for 10s -- -- 300 insulation voltage test time:1min,leakage current: < 1ma 1500 -- -- vdc isolation resistance isolation voltage :500vdc 1000 -- -- m isolation capacitance 100khz/0.1v -- 2000 -- pf switching frequency 100% load, nominal input voltage -- 400 -- khz mtbf mil-hdbk-217f 1000 -- -- k.hours without heatsink -- 28 -- weight with heatsink -- 36 -- g cooling free air convection case material aluminum alloy input specifications item test conditions min. typ. max. units models on -- -- 9.0 nominal input (12v) models off 7.8 -- -- models on -- -- 17.8 nominal input (24v) models off 16.0 -- -- models on -- -- 33.5 under voltage lockout nominal input (48v) models off 32.0 -- -- vdc input filter pi start-up time nominal input& constant resistance load -- 10 -- ms models on 3.5 -12vdc or open circuit models off 0-1.2vdc efficiency up to 89% wide input voltage range( 2:1) good low and high temperature features output short circuit protection isolation voltage: 1500vdc operating temperature: -40 ~ +85 internal smd construction six-sided metal shield industry standard pinout mtbf>1,000,000 hours industrial level specifications emc application application vra_ld-20w series offer 20w of output, wide input voltage: 9-18vdc, 18-36vdc, 36-75vdc,dual output, and features 1500vdc isolation, under voltage lockout, over current, over voltage and short circuit protection. all models are particularly suited to tele-communications, industrial, test equipments power etc. model selection vra2405ld-20w ratedpower ackage p outputvoltage inputvoltage productseries mornsun science & technology co.,ltd. address: no. 5, kehui st. 1, kehui development center, science ave., guangzhou science city, luogang district, guangzhou,p.r.china. tel: 86-20-38601850 fax:86-20-38601272 e-mail: info@mornsun.cn http://www.mornsun-power.com ctrl(4) input current (models off) -- -- 1 ma
the copyright and authority for the interpretation of the products are reserved by mornsun specifications subject to change without notice. vra_ld-20w 2013.06.13-a/3 page 2 of 4 emi specifications item test conditions test standard conduction radiation refer to recommended circuit en55022/class b output specifications recommended circuit item test conditions min. typ. max. unit output power see product program 2 -- 20 w output voltage accuracy refer to recommended circuit -- 1 3 load regulation from 10% to 100% load input -- 0.5 1 voltage regulation input voltage from low to high 100% load -- 0.2 0.5 cross regulation main load 55% load, supplement output from 10% to 100% load -- -- 5 % ripple -- 40 50 noise 20mhz bandwidth -- 75 100 mv transient recovery time -- 200 500 us transient peak deviation 25% rated load range -- 3 5 % over current protection full input voltage 120 140 150 % short circuit protection full input voltage hiccup, continual, auto-recovery 5v output -- 6.1 -- 12v output -- 15 -- 15v output -- 18 -- over voltage protection 24v output -- 28 -- vdc temperature drift refer to recommended circuit -- 0.02 -- %/ temperature derating curve (output voltage 5v) (output voltage>5v) operating temp( c) o u t p u t p o w e r ( % ) 0 20 40 60 80 100 120 -40 0 40 85 120 65 55 withoutheatsink with heatsink safe operating area operating temp( ) c o u t p u t p o w e r ( % ) 1) recommended circuit all the ura_ld-20w s eries have been tested according to the following recommended testing circuit before leaving factory. this series should be tested under load. never be tested under no load (see figure 1). vin gnd +vo 0v cin cout dc dc -vo cout dualoutput (figure 1) if you want to further decrease the output ripple, you can increase capacitance properly or choose capacitors with low esr. however, the capacitance can t exceed the maximum capacitor load in the list. 2) recommended capacitance capacitance output voltage cout ( f) cin ( f) 5(vdc) 220 12(vdc) 100 15(vdc) 100 24(vdc) 47 100 3) no parallel connection or plug and play
the copyright and authority for the interpretation of the products are reserved by mornsun specifications subject to change without notice. vra_ld-20w 2013.06.13-a/3 page 3 of 4 emc test considerations recommended circuit(en55022 class b conducted emission application) recommended pcb layout with filter to meet conducted emissions(en55022 class b)following components are needed: vra12/24xxld-20w: component value voltage reference c1,c2 4.7 f 50v 1210mlcc c3,c4 1000pf 2kv 1206mlcc l1(common choke) 1250 h p/n:(refer follow) vra48xxld-20w: component value voltage reference c1,c2 1.0 f 100v 1210mlcc c3,c4 1000pf 2kv 1206mlcc l1(common choke) 1250 h p/n: (refer follow) this common choke l1 has been defined as follow(can be assembled by hand): core:p5t14*8*7,base optical l:1250 h 25%/dcr:250m ? ,max wire: diameter 0.4mm a height:11.2mm,max b terminal length: 4.0mm,max c terminal pitch: 7.5mm,max d terminal pitch: 7.5mm,max test condition: 100khz/100mv recommended through hole: ? 0.9mm all dimensions in millimeters
the copyright and authority for the interpretation of the products are reserved by mornsun specifications subject to change without notice. vra_ld-20w 2013.06.13-a/3 page 4 of 4 outline dimensions & pin connections heatsink assembly&package diagram (with heatsink) notes 1. input voltage can t exceed this value, or will cause the permanent damage. 2. minimum operating current for 10% of rated current, if less than 10% rated current, output ripple may increase rapidly, the amplitude 1v. 3. capacitor max load tested at nominal input voltage and constant resistive load. 4. the ctrl control pin voltage is referenced to gnd. 5. only typical model listed. non-standard models will be different from the above, please contact us for more details. 6. all specifications are measured at ta=25 c, humidity<75%, nominal input voltage and rated output load unless otherwise specified. 7. in this datasheet, all the test methods of indications are based on corporate standards.
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